Motor vehicle vent window unit



FIG. 1 is a perspective view of a motor vehicle vent window unit showing our new design it being understood that the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is an enlarged exterior side elevation view thereof;

FIG. 3 is a left end elevation view of FIG. 2;

FIG. 4 is a top plan view of FIG. 2;

FIG. 5 is a right end elevation view of FIG. 2 and

FIG. 6 is an interior side elevation view of FIG. 2. 

The ornamental design for a motor vehicle vent window unit, as shown. 